A metal is exposed to the atmosphere for sometime It becomes coated with green carbonate. The metal must be
1). silver
2). copper
3). aluminium
4). zinc
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2. Who first published the periodic table?
3. What causes the mottling of the dental enamel ?
5. Helium gas is used in gas balloons instead of hydrogen gas because it is
6. The element used in the manufacture of safety matches is
7. Glycol is added to aviation gasoline because it
8. The substance most commonly used as a food preservative is
9. Question 7.33:Balance the following equation: XeF6 H2O → XeO2F2 HF